/*******************************************************************************************
*
*   raylib [core] example - window flags
*
*   Example complexity rating: [★★★☆] 3/4
*
*   Example originally created with raylib 3.5, last time updated with raylib 3.5
*
*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
*   BSD-like license that allows static linking with closed source software
*
*   Copyright (c) 2020-2025 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

using System.Numerics;
using static Raylib_cs.Raylib;
using static Raylib_cs.ConfigFlags;

namespace Examples.Core;

[ExcludeFromBrowser("runtime window-state flags don't apply to the emscripten canvas")]
public partial class WindowFlags : IExample
{
    private const int screenWidth = 800;
    private const int screenHeight = 450;

    public string Name => "Core / Window Flags";

    public string Title => "raylib [core] example - window flags";

    private Vector2 ballPosition;
    private Vector2 ballSpeed;
    private float ballRadius;

    private int framesCounter = 0;

    public void Init()
    {
        ballPosition = new(GetScreenWidth() / 2.0f, GetScreenHeight() / 2.0f);
        ballSpeed = new(5.0f, 4.0f);
        ballRadius = 20;

        framesCounter = 0;
    }

    public void Update()
    {
        // Update
        //-----------------------------------------------------
        if (IsKeyPressed(KeyboardKey.F))
        {
            // modifies window size when scaling!
            ToggleFullscreen();
        }

        if (IsKeyPressed(KeyboardKey.R))
        {
            if (IsWindowState(ResizableWindow))
            {
                ClearWindowState(ResizableWindow);
            }
            else
            {
                SetWindowState(ResizableWindow);
            }
        }

        if (IsKeyPressed(KeyboardKey.D))
        {
            if (IsWindowState(UndecoratedWindow))
            {
                ClearWindowState(UndecoratedWindow);
            }
            else
            {
                SetWindowState(UndecoratedWindow);
            }
        }

        if (IsKeyPressed(KeyboardKey.H))
        {
            if (!IsWindowState(HiddenWindow))
            {
                SetWindowState(HiddenWindow);
            }

            framesCounter = 0;
        }

        if (IsWindowState(HiddenWindow))
        {
            framesCounter++;
            if (framesCounter >= 240)
            {
                // Show window after 3 seconds
                ClearWindowState(HiddenWindow);
            }
        }

        if (IsKeyPressed(KeyboardKey.N))
        {
            if (!IsWindowState(MinimizedWindow))
            {
                MinimizeWindow();
            }

            framesCounter = 0;
        }

        if (IsWindowState(MinimizedWindow))
        {
            framesCounter++;
            if (framesCounter >= 240)
            {
                // Restore window after 3 seconds
                RestoreWindow();
            }
        }

        if (IsKeyPressed(KeyboardKey.M))
        {
            // NOTE: Requires FLAG_WINDOW_RESIZABLE enabled!
            if (IsWindowState(MaximizedWindow))
            {
                RestoreWindow();
            }
            else
            {
                MaximizeWindow();
            }
        }

        if (IsKeyPressed(KeyboardKey.U))
        {
            if (IsWindowState(UnfocusedWindow))
            {
                ClearWindowState(UnfocusedWindow);
            }
            else
            {
                SetWindowState(UnfocusedWindow);
            }
        }

        if (IsKeyPressed(KeyboardKey.T))
        {
            if (IsWindowState(TopmostWindow))
            {
                ClearWindowState(TopmostWindow);
            }
            else
            {
                SetWindowState(TopmostWindow);
            }
        }

        if (IsKeyPressed(KeyboardKey.A))
        {
            if (IsWindowState(AlwaysRunWindow))
            {
                ClearWindowState(AlwaysRunWindow);
            }
            else
            {
                SetWindowState(AlwaysRunWindow);
            }
        }

        if (IsKeyPressed(KeyboardKey.V))
        {
            if (IsWindowState(VSyncHint))
            {
                ClearWindowState(VSyncHint);
            }
            else
            {
                SetWindowState(VSyncHint);
            }
        }

        if (IsKeyPressed(KeyboardKey.B))
        {
            ToggleBorderlessWindowed();
        }

        // Bouncing ball logic
        ballPosition.X += ballSpeed.X;
        ballPosition.Y += ballSpeed.Y;
        if ((ballPosition.X >= (GetScreenWidth() - ballRadius)) || (ballPosition.X <= ballRadius))
        {
            ballSpeed.X *= -1.0f;
        }
        if ((ballPosition.Y >= (GetScreenHeight() - ballRadius)) || (ballPosition.Y <= ballRadius))
        {
            ballSpeed.Y *= -1.0f;
        }
        //-----------------------------------------------------

        // Draw
        //-----------------------------------------------------
        BeginDrawing();

        if (IsWindowState(TransparentWindow))
        {
            ClearBackground(Color.Blank);
        }
        else
        {
            ClearBackground(Color.RayWhite);
        }

        DrawCircleV(ballPosition, ballRadius, Color.Maroon);
        DrawRectangleLinesEx(new Rectangle(0, 0, GetScreenWidth(), GetScreenHeight()), 4, Color.RayWhite);

        DrawCircleV(GetMousePosition(), 10, Color.DarkBlue);

        DrawFPS(10, 10);

        DrawText($"Screen Size: [{GetScreenWidth()}, {GetScreenHeight()}]", 10, 40, 10, Color.Green);

        // Draw window state info
        DrawText("Following flags can be set after window creation:", 10, 60, 10, Color.Gray);

        DrawWindowState(FullscreenMode, "[F] FLAG_FULLSCREEN_MODE: ", 10, 80, 10);
        DrawWindowState(ResizableWindow, "[R] FLAG_WINDOW_RESIZABLE: ", 10, 100, 10);
        DrawWindowState(UndecoratedWindow, "[D] FLAG_WINDOW_UNDECORATED: ", 10, 120, 10);
        DrawWindowState(HiddenWindow, "[H] FLAG_WINDOW_HIDDEN: ", 10, 140, 10);
        DrawWindowState(MinimizedWindow, "[N] FLAG_WINDOW_MINIMIZED: ", 10, 160, 10);
        DrawWindowState(MaximizedWindow, "[M] FLAG_WINDOW_MAXIMIZED: ", 10, 180, 10);
        DrawWindowState(UnfocusedWindow, "[G] FLAG_WINDOW_UNFOCUSED: ", 10, 200, 10);
        DrawWindowState(TopmostWindow, "[T] FLAG_WINDOW_TOPMOST: ", 10, 220, 10);
        DrawWindowState(AlwaysRunWindow, "[A] FLAG_WINDOW_ALWAYS_RUN: ", 10, 240, 10);
        DrawWindowState(VSyncHint, "[V] FLAG_VSYNC_HINT: ", 10, 260, 10);
        DrawWindowState(BorderlessWindowMode, "[B] FLAG_BORDERLESS_WINDOWED_MODE: ", 10, 280, 10);

        DrawText("Following flags can only be set before window creation:", 10, 320, 10, Color.Gray);

        DrawWindowState(HighDpiWindow, "FLAG_WINDOW_HIGHDPI: ", 10, 340, 10);
        DrawWindowState(TransparentWindow, "FLAG_WINDOW_TRANSPARENT: ", 10, 360, 10);
        DrawWindowState(Msaa4xHint, "FLAG_MSAA_4X_HINT: ", 10, 380, 10);

        EndDrawing();
        //-----------------------------------------------------
    }

    public void Unload()
    {
    }

    public static int Main()
    {
        // Initialization
        //---------------------------------------------------------
        // Possible window flags
        /*
        FLAG_VSYNC_HINT
        FLAG_FULLSCREEN_MODE    -> not working properly -> wrong scaling!
        FLAG_WINDOW_RESIZABLE
        FLAG_WINDOW_UNDECORATED
        FLAG_WINDOW_TRANSPARENT
        FLAG_WINDOW_HIDDEN
        FLAG_WINDOW_MINIMIZED   -> Not supported on window creation
        FLAG_WINDOW_MAXIMIZED   -> Not supported on window creation
        FLAG_WINDOW_UNFOCUSED
        FLAG_WINDOW_TOPMOST
        FLAG_WINDOW_HIGHDPI     -> errors after minimize-resize, fb size is recalculated
        FLAG_WINDOW_ALWAYS_RUN
        FLAG_MSAA_4X_HINT
        */

        // Set configuration flags for window creation
        //SetConfigFlags(VSyncHint | Msaa4xHint | HighDpiWindow);// | TransparentWindow);
        InitWindow(screenWidth, screenHeight, "raylib [core] example - window flags");

        SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
        //----------------------------------------------------------

        var game = new WindowFlags();
        game.Init();

        // Main game loop
        while (!WindowShouldClose())    // Detect window close button or ESC key
        {
            game.Update();
        }

        game.Unload();

        // De-Initialization
        //---------------------------------------------------------
        CloseWindow();        // Close window and OpenGL context
        //----------------------------------------------------------

        return 0;
    }

    private static void DrawWindowState(ConfigFlags flag, string text, int posX, int posY, int fontSize)
    {
        var onColor = Color.Lime;
        var offColor = Color.Maroon;

        if (Raylib.IsWindowState(flag))
        {
            DrawText($"{text}on", posX, posY, fontSize, onColor);
        }
        else
        {
            DrawText($"{text}off", posX, posY, fontSize, offColor);
        }
    }
}